ー　Regarding after-sales support　ー

I do accept repair requests.

Unfortunately, I do not have a warranty period.

Repair costs vary depending on the content, but I do not intend to ask for a large amount.

I would like you to cover the one-way shipping costs (I will cover the return shipping costs).

ー The sound may go crazy. ー

The pitch of a tongue drum is determined by the length of the notches in the tone bar.
You might think that if that length doesn’t physically change, the sound won’t change.
Unfortunately, this is not the case. It can go out of tune.
This is a structural problem with the instrument and is a possibility for all tongue drums.

The pitch does not get higher.

ー　Why does the sound go awry?　ー

This is due to metal fatigue at the base of the sound plate.

When played, the tone bar vibrates hundreds of times per second.
These vibrations are supported by the base of the tone bar.
Eventually, the rigidity of the base weakens, and the sound becomes lower.

This also depends on playing style.
If you play by touching the instrument gently, the tone may not go out of tune for many years.
On the other hand, if you strike the instrument forcefully to increase the volume, the chances of the sound becoming lower are increased.

*Strike forcefully to increase the volume is counterproductive for many reasons.

*Although Propanota avoids using this material, this tendency is stronger in instruments with thin soundboards at the base.

*The same applies to types that use thin materials.
If the material is iron, the diameter is close to 30 cm, and the weight is less than 3 kg, there is a high possibility that the material is thin.

ー　Repair method　ー

① Cut and split the top and bottom of the instrument.

② Re-weld the back of the soundboard.

③ Grind the weld marks

④ Re-weld the top and bottom

⑤ Grind the weld marks

⑥ Remove the paint if there is any

⑦ Temporary tuning

⑧ Final tuning after painting

If it’s just welding, it’s possible to do it without splitting the top and bottom, but I avoid this method because scraping off the weld marks on the striking surface will ruin the uniformity of the surface.

It’s also possible to raise the pitch by scraping off the tip of the soundboard to make it thinner, but the rigidity of the base will still be lost, so I avoid this method as well.

If there is a pattern, it is not possible to reproduce the pattern perfectly.
In particular, in the case of a mandala pattern, the only thing we can do is lower the sound.

This is how to return the pitch to its original height.
If you want to lower the overall pitch, you can do it yourself.

Just use a hacksaw (a cheap one will do) and lengthen the cuts in the tone plates. It will take time, but you can do it.